As the screenshot shows, the "huge data" is mostly "applications" (each column represents a "detail view" of the one left to it). From the apps, most space is consumed by Facebook and Twitter.
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IzzyJul 20 '14 at 18:09

How do i know which apps have that huge data? Thanks
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Blaze TamaJul 20 '14 at 9:42

You can see in your screenshot. Facebook is using 122.9 MiB, Twitter is using 90.4 MiB, etc. On recent Android versions, the same data are available in the apps manager: each app shows how much space it takes up, and you can sort largest-first.
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Dan HulmeJul 20 '14 at 9:46